"Being Green" Question

Okay, I know probably everyone has noticed this before, and I've noticed it all my life. It's kind of bothered me, so here I am, posting it. You all know the song "It's Not Easy Being Green". In the part of the song where Kermit sings "And it can be big like a___" There are two different versions. In one he sings "it can be big like an ocean or important like a mountain or tall like a tree" and in the other he sings "it can be big like a mountain or important like a river or tall like a tree". So my question is...
Which one came out first? Is one just Sesame Street and the other a Muppet Show version? I always get confused. Personally, *I* perfer the first version I mentioned (big like an ocean) but that's just me...